AI Infrastructure & MLOps Free

LMQL

Programming language for constrained prompts, queries, and model interactions

Visit official website
PricingFree
Starting price$0
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentCloud
Last verifiedAugust 3, 2026
Overview

Tool overview

LMQL is listed under AI Infrastructure & MLOps AI tools.

Summary

What is LMQL?

LMQL is an open-source query language for language models. It lets developers combine prompts, variables, constraints, control flow, and decoding directives while targeting supported local or hosted models.

Best fit

Best for

Researchers and developers programming constrained language-model interactions

Audience

Who is it for?

AI researchersPython developersPrompt engineersAcademic teams
Recommendation

Decision note

Re-researched from current official sources in two passes under V411. Preview only. Apply only after failures = 0, warnings = 0, unmapped = 0, all explicit clears are reviewed, image import is disabled or V380 dimensions pass, and one representative WordPress edit screen is checked against the CSV.

Capabilities

Key features

Prompt-oriented query language

Constraints on generated variables

Control flow and reusable functions

Local and hosted model backends

Workflows

Use cases

Building constrained prompt programs

Running reproducible LLM experiments

Extracting formatted model outputs

Comparing model backends

Strengths

Pros

  • Expressive declarative approach
  • Open-source research foundation
  • Supports reusable prompt logic
Considerations

Limitations

LMQL is useful for controlled experiments and applications, but teams must validate current backend compatibility, performance, output semantics, and long-term maintenance.

Cost

Pricing details

Pricing modelFree
Starting price$0
Free planYes
Free trialYes
Pricing context

Billing options

Free open sourceModel-provider usage
Pricing context

Pricing note

LMQL is free and open source. Users pay only for hosted model APIs, local compute, or infrastructure.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

OpenAI

Hugging Face Transformers

llama.cpp

Specs

Technical details

PlatformsWeb
Multilingual supportYes
Login requiredNo
Open sourceYes
LicenseApache-2.0
DeploymentCloud
CompanyETH Zurich SRI Lab
Current version0.7.3
Models / versionsOpenAI Hugging Face Transformers llama.cpp
Editions / plansWeb Playground Python package CLI
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

LMQL is an open-source query language for language models. It lets developers combine prompts, variables, constraints, control flow, and decoding directives while targeting supported local or hosted models.
Researchers and developers programming constrained language-model interactions
The listed pricing model for LMQL is free. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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